Damper device

Abstract

A damper device includes an input element to which a torque from an engine is transmitted; an intermediate element; an output element; a first elastic body arranged to transmit a torque between the input element and the intermediate element; a second elastic body arranged to transmit a torque between the intermediate element and the output element; a rotary inertia mass damper that includes a mass body rotating in accordance with relative rotation between the input element and the output element and that is arranged between the input element and the output element to be parallel to a torque transmission path including the first elastic body, the intermediate element and the second elastic body; and an attenuation mechanism configured to attenuate resonance of the intermediate element.

1 . A damper device configured to include an input element to which a torque from an engine is transmitted; an intermediate element; an output element; a first elastic body arranged to transmit a torque between the input element and the intermediate element; and a second elastic body arranged to transmit a torque between the intermediate element and the output element, the damper device comprising:
 a rotary inertia mass damper that includes a mass body rotating in accordance with relative rotation between the input element and the output element and that is arranged between the input element and the output element to be parallel to a torque transmission path including the first elastic body, the intermediate element and the second elastic body; and   an attenuation mechanism configured to attenuate resonance of the intermediate element.   
     
     
         2 . The damper device according to  claim 1 ,
 wherein the attenuation mechanism is configured to generate a frictional force between the intermediate element and at least one of the input element and the output element.   
     
     
         3 . The damper device according to  claim 1 ,
 wherein the attenuation mechanism is configured to generate a frictional force between the input element and the intermediate element.   
     
     
         4 . The damper device according to  claim 3 ,
 wherein the attenuation mechanism includes a friction member configured to rotate integrally with one of the input element and the intermediate element; and an urging member configured to urge the friction member from the one of the input element and the intermediate element toward the other.   
     
     
         5 . The damper device according to  claim 2 ,
 wherein the attenuation mechanism includes a friction member configured to rotate integrally with one of the intermediate element and the output element; and an urging member configured to urge the friction member from the one of the intermediate element and the output element toward the other.   
     
     
         6 . The damper device according to  claim 2 ,
 wherein the attenuation mechanism includes a first friction member configured to rotate integrally with one of the input element and the intermediate element; a first urging member configured to urge the first friction member from the one of the input element and the intermediate element toward the other; a second friction member configured to rotate integrally with one of the intermediate element and the output element; and a second urging member configured to urge the second friction member from the one of the intermediate element and the output element toward the other.   
     
     
         7 . The damper device according to  claim 2 ,
 wherein the attenuation mechanism is configured to vary the frictional force in accordance with a rotation speed of the input element.   
     
     
         8 . The damper device according to  claim 7 ,
 wherein the attenuation mechanism is configured to increase the frictional force with an increase in rotation speed of the input element.   
     
     
         9 . The damper device according to  claim 1 ,
 wherein a damping ratio of the intermediate element that is determined based on a moment of inertia of the intermediate element and stiffnesses of the first and the second elastic bodies is smaller than a value 1, and wherein a rotation speed corresponding to a natural frequency of the intermediate element is higher than a minimum rotation speed in a rotation speed range where a torque is transmitted from the input element to the output element via the torque transmission path.   
     
     
         10 . The damper device according to  claim 1 ,
 wherein the output element is operatively coupled with an input shaft of a transmission.   
     
     
         11 . A damper device configured to include an input element to which a torque from an engine is transmitted; a first intermediate element; a second intermediate element; an output element; a first elastic body arranged to transmit a torque between the input element and the first intermediate element; a second elastic body arranged to transmit a torque between the first intermediate element and the second intermediate element; and a third elastic body arranged to transmit a torque between the second intermediate element and the output element, the damper device comprising:
 a rotary inertia mass damper that includes a mass body rotating in accordance with relative rotation between the input element and the second intermediate element and that is arranged to be parallel to the first elastic body, the first intermediate element and the second elastic body; and   an attenuation mechanism configured to attenuate resonance of the first intermediate element.   
     
     
         12 . A damper device configured to include an input element to which a torque from an engine is transmitted; an intermediate element; an output element; a first elastic body arranged to transmit a torque between the input element and the intermediate element; and a second elastic body arranged to transmit a torque between the intermediate element and the output element, the damper device comprising:
 a rotary inertia mass damper that includes a mass body rotating in accordance with relative rotation between the input element and the intermediate element and that is arranged between the input element and the intermediate element to be parallel to the first elastic body; and   an attenuation mechanism configured to attenuate resonance of the intermediate element.